1. Introduction 2. Fish lateral line inspired perception and flow-aided control: a review 3. Boxfish-like robot with an artificial lateral line system 4. Online state estimation of a boxfish-like robot using artificial lateral line system 5. Artificial Lateral Line Based Local Sensing Between Two Adjacent Boxfish-Like Robots 6. Artificial Lateral Line Based Relative State Estimation for Two Adjacent Boxfish-Like Robots 7. Summary